JWT Decoder Online — Decode JSON Web Tokens (Header & Payload)

Free online JWT decoder. Inspect JSON Web Token headers, expiration dates, user claims, and scopes without sending tokens to any server. 100% client-side.

✓ Decodes Header (algorithm, type) and Payload (user claims, exp, iat, sub)

✓ Computes human-readable expiration time with time-remaining countdown

✓ 100% client-side execution — your authorization tokens never touch a server

✓ Formats decoded claims with clean syntax indentation

How It Works

  1. Paste your Bearer token or raw JWT string into the input box.
  2. The tool splits the token at the dot separators and decodes the Base64URL payload.
  3. JSON claims and expiration dates are parsed and displayed instantly.